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Séminaires REPARTI


Les Séminaires REPARTI à l'Université Laval ont lieu le vendredi à 11h30.
Veuillez consulter le programme pour plus de détails.

 

 

 

 

REPARTI

MIVIM

May 11 2018 11:00AM

Jean-François Lalonde
Laboratoire LVSN
Dép. de génie électrique et de génie informatique, Université Laval

From Faces to Outdoor Light Probes



Résumé

Image-based lighting has allowed the creation of photo-realistic computer-generated content. However, it requires the accurate capture of the illumination conditions, a task neither easy nor intuitive, especially to the average digital photography enthusiast. This paper presents an approach to directly estimate an HDR light probe from a single LDR photograph, shot outdoors with a consumer camera, without specialized calibration targets or equipment. Our insight is to use a person’s face as an outdoor light probe. To estimate HDR light probes from LDR faces we use an inverse rendering approach which employs data-driven priors to guide the estimation of realistic, HDR lighting. We build compact, realistic representations of outdoor lighting both parametrically and in a data-driven way, by training a deep convolutional autoencoder on a large dataset of HDR sky environment maps. Our approach can recover high-frequency, extremely high dynamic range lighting environments. For quantitative evaluation of lighting estimation accuracy and relighting accuracy, we also contribute a new database of face photographs with corresponding HDR light probes. We show that relighting objects with HDR light probes estimated by our method yields realistic results in a wide variety of settings.


Le séminaire sera présenté à 11h au local PLT-2548.
La présentation sera donnée en français (les diapos seront en anglais).




     
   
   

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